K2 - LOW SENSITIVITY ON 30 AND 17 METERS

[G4BUE]

I am puzzled as to why my K2/100 has lost most of its sensitivity on
17 and 30m.

It is the K2/100 I use at my Florida QTH and when I returned from a
visit of a few months to the UK, I found it has lost most of its
sensitivity on 17 and 20m.  I can only hear very strong signals and
they sound very weak.  The other bands are fine and it transmits ok
on all bands, including 30 and 17m.

I have tried tweaking L8 and L9 and C21 and C23 (30m) and C32 and C34
(17m) but this has not made any difference.

I cannot find any other part(s) of the K2/100 circuit that only
affect 17 and 30m on receive.

I have researched the Reflector archives in the hope of finding
someone with a similar problem, without success.

Any help and suggestions will be appreciated, please.

Thanks and 73 de Chris, N4CJ (G4BUE)



_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Don Wilhelm-3]

Chris,

You are correct, there is nothing unique to 30 meters and 17 meters.  Are
you certain your antenna is still OK?

If you have the KAT100, that could have some problem with the inductance and
capitance selected during tuning that is giving the appearance of a weak
received signal.

We really need more data to give a better answer.

73,
Don W3FPR

> -----Original Message-----
> I am puzzled as to why my K2/100 has lost most of its sensitivity on
> 17 and 30m.
>
> It is the K2/100 I use at my Florida QTH and when I returned from a
> visit of a few months to the UK, I found it has lost most of its
> sensitivity on 17 and 20m.  I can only hear very strong signals and
> they sound very weak.  The other bands are fine and it transmits ok
> on all bands, including 30 and 17m.
>
> I have tried tweaking L8 and L9 and C21 and C23 (30m) and C32 and C34
> (17m) but this has not made any difference.
>
> I cannot find any other part(s) of the K2/100 circuit that only
> affect 17 and 30m on receive.
>
> I have researched the Reflector archives in the hope of finding
> someone with a similar problem, without success.
>
> Any help and suggestions will be appreciated, please.
>
> Thanks and 73 de Chris, N4CJ (G4BUE)
>
>

--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.432 / Virus Database: 268.17.3/642 - Release Date: 1/20/2007
10:31 PM

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[G4BUE]

Thanks Don.  

I have checked both the 17m antenna (2 el quad) and the 30m antenna
(6BTV) on another radio, and they are both working fine.

I have the K2/100 with the 160m, DSP, and NB options and do not have
the KAT100.

73 de Chris, N4CJ (G4BUE)


On 21 Jan 2007 at 13:01, Don Wilhelm wrote:

> Chris,
>
> You are correct, there is nothing unique to 30 meters and 17 meters.
> Are
> you certain your antenna is still OK?
>
> If you have the KAT100, that could have some problem with the
> inductance and
> capitance selected during tuning that is giving the appearance of a
> weak
> received signal.
>
> We really need more data to give a better answer.
>
> 73,
> Don W3FPR
>
>
>
> > -----Original Message-----
> > I am puzzled as to why my K2/100 has lost most of its sensitivity
> on
> > 17 and 30m.
> >
> > It is the K2/100 I use at my Florida QTH and when I returned from
> a
> > visit of a few months to the UK, I found it has lost most of its
> > sensitivity on 17 and 20m.  I can only hear very strong signals
> and
> > they sound very weak.  The other bands are fine and it transmits
> ok
> > on all bands, including 30 and 17m.
> >
> > I have tried tweaking L8 and L9 and C21 and C23 (30m) and C32 and
> C34
> > (17m) but this has not made any difference.
> >
> > I cannot find any other part(s) of the K2/100 circuit that only
> > affect 17 and 30m on receive.
> >
> > I have researched the Reflector archives in the hope of finding
> > someone with a similar problem, without success.
> >
> > Any help and suggestions will be appreciated, please.
> >
> > Thanks and 73 de Chris, N4CJ (G4BUE)
> >
> >
> --
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.5.432 / Virus Database: 268.17.3/642 - Release Date:
> 1/20/2007
> 10:31 PM
>
>

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com